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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '807750f48fe07d2fdb3d5b46a83e09c05adb0d776ceda8658bcd4491555c19ae' 
  AND token = '/Gi0H08KsZ5UMcdJO5lM0Xl59VGvzpXg/KFNyu3RgIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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