SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9826d93f2e99359115ad2ff179c48349aec84cbbe807216ffdbd56fe6e8921f' 
  AND token = 'gIX+lSxEQgGa6mMoZgoy7nVh+UOWbqtjZkwyuPCs1b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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