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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ddf2647e43f5ff84f0f05cb02d88414b4d7799d8cfcc025795d8adb847a54ad' 
  AND token = 'HTN7C2qC0sUEtOIcWK47mHphAAG5wq1aVOVV5cZYVow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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