SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a86292c14c4ad32c5e6603cf708846c0ad4097d55f46aa723b6c97f42d6f75' 
  AND token = 'LquDyPCn+qwRIM6buKgzXmjEnyQX/RT1LvpFCa5puxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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