SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec7633a71993797fdaed91165bed43b8642d50a340aff7832baa63d3abca981d' 
  AND token = 'iQUSWB0mWSCgJTTltR+7iDPZ9icFXfFH/vtOJWIUQG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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