most crypts will have a + design at the entry, where one leg of the + is the entrance, and the other 3 are the branches to explore. The branches are random. It is somewhat unusual for there to be a spawner that generates enemy who can access the entrance without you having cleared some mud piles. You can hear the spawners, they buzz, loudly. If you are careful, in MOST crypts you can explore at least 2 of the 3 branches without encountering a spawner at all. I recommend you just take these safer paths until you have your level 1 iron gear crafted, then try again.

If you click your crypt markers on the map (you would make the marker as well) you can set them to have a red X through them. Make a scheme to mark crypts that are mined out vs ones you want to return to vs unopened. I put the red X on mined out, and specific letters on the markers for new vs partly cleared. You will partly clear for a variety of reasons, including just getting more than you can carry.