Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcae75929b09efc89cd8334c6dd12933f8feed439a1817336c5eddc892c85a8b' 
  AND token = 'Ik0zc4cQZgxzoMgpyiGGeKt3n5vNCoCGiIRHYQxYA9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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