SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823c573bedcca63d20da8110f688f665fba932fef9542a27ba7438eb5bf64514' 
  AND token = 'aojeXTnZjlhCr6BwnQaIMB3KzafAXLwU3XkgWcl2Gpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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