SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2423f20cb4e23fc846d3df532492f4ffa52a9363d82c95a2e6307c7a59c08a17' 
  AND token = 'iTomTfsJB/5TRnyo0ZdlkxRE1G+V9yHGK5Du4RqFOOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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