SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9019ba2a025327c94731ec209114251783aee5bfce4b844aa6d8c202b6bc3832' 
  AND token = 'Qm1nu5UJhlktIPoCEREK4AfRB2y+wxQeFqWnRGShuzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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