SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '977ae65edd7f5e4fd3d0b3b8a508872d8c7650ba6f661e981bbc541fad097c87' 
  AND token = 'XtOnURCVMm013oRG3qXars++SCB5PTUEHzXNZ+P/IHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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