If you have a pre-made pie crust that has expired, it is still safe to use as long as it doesn't smell bad or look moldy. The expiration date is more of a guideline than anything else. Pie crusts are made with flour, water and fat (usually butter or shortening), so they don't contain any ingredients that will go bad quickly. That being said, an expired pie crust may not taste as fresh as a new one, so it's best to use it within a few days of the expiration date if possible.