SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '684a3eb6aec45747c119600a49395b8bb3afb508aa4eb6ab27dd84de481019d5' 
  AND token = 'qjG3BTm4quhL08TYBIeD4KBwqEvW2Rrq/TYSDzph8Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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