SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c96a9f38ea24516a18a1bbf8de7230b891bf1983a1bffe8c3def8fe79da8cc7' 
  AND token = 'vxyKTOgQPGutjE0GYa4CQ57TY6xpXIZDz7j+LhP4cYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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