SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd60786940a84222a438d123c202cd731649c9a828000452d8e54348f3d263ef7' 
  AND token = 'J8K2NS1mhGDEzO5Ips1SoO/ODLOjVDFYtmVqG5Ui0mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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