SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1b3e3c3cf0fa5821b5b4310ad2297e0c53d90095d8464cf540e6fb5b05adb3e' 
  AND token = 'kEoNroVbKOzRigT9iUPBiDZoK91JP+I9hiHGnqW/EFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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