SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2aa54a9db3ee60bcc4860e87f2c9b5262d5574d770390f2f9e3571e18b9fdb1' 
  AND token = 'Ul670VURltzwNUlL3WIYIhzD7EWj3ZjPvTa3vX/MztI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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