SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c283cba3265e771cc85415b9387ed0dce4c584aaad68cf65ef46bac030080451' 
  AND token = 'xR3APimPvHbxr5JwpvZlYo/knPnBqvLI3hi4sKscB+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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