Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb16aa09fd4f9ffee9c94d7cb5f447c41b06b66d09f537d644ab0e3a42e4a10' 
  AND token = '/+FVM2mmRDQpaPtLQVcJ32WxQGItAxYme+gUFTwEd2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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