SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a923b7d16c77c890e2312f8de866f8a390c69f8857a3fa05069be0ed3d7eef50' 
  AND token = 'zGhq31x+mUDaQ//6zVIXikqjvMmALBSPWafHtmCUlBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00892

JSON explain

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