Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1079f5e715847395ef74fb2d5b99befd4ec08afc683aa85d37a4bffcf9c4be89' 
  AND token = '75ggocJbTW889b3caWmitF0B1q1Jq8iibr2NqvB3AVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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