SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e129c760efacd0d1d14ffa38e6440336b946160a9b1142b9bcd5fbc1a149db1c' 
  AND token = 'Dts9jWmGN+6KagV74iDAZji2857GvpvIGtj+wM7YAhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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