SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9d38a83c02bff974928b1fc384ce345a3d4ad1778dac7fde1cb59316e375c02' 
  AND token = '1hOwYZGpSUJsrK0PqzUFBVCy3xQcj4AEXC3U6KHbKv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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