SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbf1d89294c7c329fbf2bab2521e5bfcb6684e9245ec30e29410440f8806fea6' 
  AND token = 'jxCUXL6YSa8bvnrtJ/ltxIjqwe4qDwTVlotDSBRwlGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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