Can I use hydraulic water-stop cement to fix foundation leak?
Indeed, hydraulic water-stop cement can fix your leak. 

With that said I strongly advise 2 things. Finding out the actually cause (ie. foundation sinking or separating) and remove all the sealer you currently have, so the product adheres to the concrete and stucco properly.

Quickrete's claim: 
QUIKRETE® Hydraulic Water-Stop Cement will block running water
when application is made to masonry or concrete surfaces. This
special formulation allows the product to obtain high strength and
rapid setting while repelling water.
QUIKRETE® Hydraulic Water-Stop Cement solves leakage problems
wherever active water is present, in all masonry and concrete above
and below grade.