SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce86bd495be4400565487c12795a7b5c4a311ef9c8f334038bf463bce4f2dc54' 
  AND token = '1fAT/94jAGC4SjuOAY9nj3w0Qq62eVDhuMI/+ZVn9lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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