SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd61f14cb8a17b29df1daf733932c623d8185a528df41cb3b4648b2e7655bf496' 
  AND token = 'hovlVCbODMI/9niT8jLvGyEjfr6ahtztqH8U+jFRF64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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