SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1abe63ca47b3cbf9d9d0c71e6f345698bfd25cb14680c6535a66944156ec81e8' 
  AND token = 'MhZRZCvA0NjqW4JYz6/o0bSYM1XLdnVEVaOYfKOGZ9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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