SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daa599f72d208602dde9e795bfaf3b3e5e4efb7af05edd486a31857bf4dfbe7e' 
  AND token = 'cOqAGL1Xh+5C3QY3MhWXGx8HJLcDIZKZ01VebMKUmP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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