The current rating of a MOSFET is often nonsense, here the TO220 package can't handle more than about 50A(30A is a more conservative rating) so 115A is utter fiction.
You always select a MOSFET by choosing the on-resistance given the max power-dissipation
you can allow. You also check that the max on-current times the on-resistance is a small
voltage (much less than the gate drive voltage).
The max current rating is almost always a way of saying the max heat dissipation of the
die given an infinite heatsink, which is never useful. See footnote 5 in that datasheet.
So worked example:
Want to switch 10A without needing more than a small heatsink. Thus power
dissipation is limited to 1W or so. Therefore I-squared-R <= 1, therefore R <= 0.01 ohm