mio-aio is used at run time in 1 crate. It's used only as a dev dependency in 2 crates.

Depender (with downloads and own rev deps) mio-aio version
tokio-file ^0.7.0
4.3M 13398 tokio dev ^0.7.0
1.4K 19 tokio_wasi dev ^0.7.0