SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a11328005581408a91eed76f2ed257d320be711bf7033dc291562ebcf2845bb' 
  AND token = 'uW4186hxf+7rgnCmnnDbFv7wJTDoKjkZXi9g7tSkLxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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