Sealing a small crack in poured concrete foundation
An 1/8 inch crack that is weeping water is a fairly serious fault. Wondering, is the crack displaced or flat?  Regardless, any crack that allows water to seep through means the crack if through the entire wall. Normally I would recommend chiseling a "key" or an inverted "V" into the concrete and patching it with expanding hydrolic cement and coating the crack with a waterproofing rated for up to 4 PSI.  I personally have never used the product you linked to.  What is important is that bonds soundly. I would think it might be worth a try since you intend to do a better fix from the exterior in the spring. Remember, a simple concrete pad ove the area will not fix your problem, the leak is ground water, not a little ice melting on the top of the ground.