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Objective Lens
First and foremost, you will want to choose a scope with a large objective lens. In a scope description, the diameter of the objective lens is indicated by the last number; for example, a 3-9x50 mm scope has an objective lens that is 50 mm wide. The objective lens is at the far end of the scope and allows light into your scope's interior. The widest objective lens that is commonly available is 50 mm.
Variable Power
For low-light situations, you will get your best results with lower magnification settings. For this reason, your best choice would be a variable power scope with an adjustable magnification range that includes a low power setting. Lower magnification settings utilize the available light to give you a better sight picture.
Illuminated Crosshairs
Many scopes are available that have illuminated crosshairs with adjustable brightness. The advantage of illuminated crosshairs is that they provide you with a contrast between your crosshairs and your target. Since your crosshairs are naturally dark, they may become hard to see in lower light; illuminated crosshairs solve that problem. When using illuminated crosshairs, do not set the brightness level too high; excessive light can make your target hard to see.
The Best Combination
Taking all these different variables into consideration, your best choice would be a variable power scope with a low magnification setting, a large diameter objective lens and illuminated crosshairs. For example, the Leupold VX-III 3.5-10x50 Illuminated Reticle scope would be an excellent choice for low-light shooting. Keep in mind, that this is only one example of the many quality scopes available with similar features.