R: given a list of matrices, determine which ones have a specified value in a specific element

Question

I have a list L of length k whose elements are matrices of equal dimension n x m. Suppose I want to know which of the matrices in the list satisfy the condition M[i,j]==1.

Obviously,

grep(1, L)

will not work as it will return all instances of 1 in the matrices, rather than just those where 1 occurs in position i,j. Is there any way to do this other than using a for loop and checking each matrix individually?

As a simple example, if I have a list of three matrices:

m1 = rbind(c(0,0,0),c(0,0,0),c(1,1,1)
m2 = rbind(c(1,1,1),c(1,0,0),c(0,0,0)
m3 = rbind(c(0,0,0),c(0,1,0),c(1,1,1)
mlist = list(m1,m2,m3)

I would like to find for which matrix/matrices in mlist M[2,2]=1, the correct output would be 3, since the third matrix in the list satisfies this condition.