SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f9dc514bc131ebc68e1431163147cb59ef3bafd472b125276966c0602a2a785' 
  AND token = 'yH4I36euQYcuARvP2K+JXG3QIqAGSRAgiZJ8Ug2XPKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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