SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb814401cd0d5ebde6591ec84e6acfce674ff9de4398eef8f1ab35d99f1817a8' 
  AND token = 'wnhmoglE/d92RKvCv6gik8RwgzBLsFZ6UvwKTs+oUmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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