SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94dd9662f877826563a37696100f6490b1e665e5cbbf404fbafe329dac0bb998' 
  AND token = 'km3k/NhxFMXqZ/nx9wKhuYaFCEnHkKEsq/uIzRDU+3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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