SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6624654ac4c30dbddf94cdfcb453d8c28a8bfb413de79c8b0a3cef06e23845e5' 
  AND token = 'l4GKjEyYYctMuS/cZzNVmCw7dkewi7DuWo5KGUGg1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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