SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afb35f99a16520fc4dd20536a8b34cce53ec50651b004b4fb72458cf0df6d9aa' 
  AND token = 'Z6K08V9kVPtOGgtj7HyP4N3XIM/xHAujwkmzFFkP/R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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