SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b8d4a0cd522048f1b1386247b1a9c832c55675b945f10923cbb834044ba6870' 
  AND token = 't3fXWKc8iJQDwCh/Y3lW8XTzhmzXtqFfjGdk8AFPMUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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