SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '853590f6c7025d5d0eb9b26390d0f46b19eade6304891e78eb0bee8a7a33cc11' 
  AND token = 'fi+c0inNbBCjvuFMw47zfkSYVYyNNJgCw9tpLpVwK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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