SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36508acf9c18583daa031576632b3593031ff8f7a1d366fbbd611b311ec45070' 
  AND token = 'wvvnXLDWHsEo1+PSzJzuzxS9YyYMki4ZXMnNYyYcG4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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