Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7ff493fc06361a82c40241d9ec3139998844426a48cb0588ce506ffe747fb42' 
  AND token = '20SLcJ6IlDEACoy5iFxgPWOOVqI87dPaWY6yigp6E0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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