The ring of life works in the keyslot, but the anti poising ring must be equiped.
The antipoison rings are intended to only work if equipped on the finger. Don't know about the ring of life.
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There are now three types of magical rings, the two older ones work without being worn. There's only one finger slot, so I think it's reasonable to keep the old behaviour (otherwise all higher level players would always wear the ring of life for safety, assuming consistent behaviour). Also, having poison resistance as an item attribute was to avoid dependence to any particular item, but now it's limited to wearable items