SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5386bb46d8e0279e350353336fab9f8c8be367f529bdc4d1c39773bcdaa42334' 
  AND token = 'wZRg2Nr9GJ22RGXTO8BweuBKVJNrPglsFwNOvaYDDn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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