Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd80a3ae89d4af48c2953d8052972f04030c3f3e883a7d7bc029b923ac82a9828' 
  AND token = 'MZTtwzndSVgLdhw73e7P0b45Id4qtnxsPos+qOnkKKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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