SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3d0d8b7ab94166b78c4105b5ffcb318dd219abfd82a58d60a3f748b9bca7945' 
  AND token = 'Wzf6nsu/SC+xW4CB2THL/9oZYgXmETZ9OdtotxzufAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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