SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c4f89e06507f56e7c33aaac2e17b02b046c198e72d7798d396fe4cdb622c933' 
  AND token = 'DJnY5JkFyPbhKACAchTBkQ8Fr/xL5O63ujwLHM00TCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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