Has an AFL game ever ended 64-31?
Exactly once. On June 25, 1910, Carlton beat St Kilda 64-31, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 64-31 in league history.
That makes 64-31 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 65-31 has happened never and 64-32 has happened never.