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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c34ec1e99801e4610288adc01e4500b7527257dc4939093f8aca58240b419d1e' 
  AND token = 'n0ISgpi1p6/c85KXKvJ+LQSgjcxtU7XGigB4p4rfhjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}