SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40f7ec079b3e2a4f422961f0b35579e3e309191c759930db7d0ca12d9395f168' 
  AND token = 'fxNArbr7zGHyQwbfWG7lXBm4Ojw0vO5FuO+pq71YWCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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