SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5269a22b43661043d42cc45557b7192f0ad168d0ec5e2685b175613f7fb41fbf' 
  AND token = 'iJZxLXSfkkbEctVv9CWK50nclJmGwsC8+boxIP0qdLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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