SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '490eee1c14c3c595ae6caac54df5e6b8c99ff012ff742b9538d750e6cc9d72dd' 
  AND token = 'fAgXyxGjuY+2qmJdaTnkCGtjhFXm4VfS1oeqMfIKkUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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