SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fd1495b9a5f2e1243bb7bf92c2ea862146dd973d77ea75ce86443017f4f0fab' 
  AND token = 'AJ9nsuJ2ZippELmPrVGmiuHhc5Gnpo29Rg1J67wCj0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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