SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38c8dbfe96d0c06b8e4934f9b4bb670e3170f4e903597ce539967704657ab933' 
  AND token = 'nJJ+NLs8Ytm881KprU/Tgi+eUiHUXLHGwKZm7kfnAzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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