SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82cb4d5699e3f7116272f2fc536e46fb6d675843f99805d6c85c50c623c9f2d8' 
  AND token = 'OYvfkfVfs/bOMgfaVEOAdubaRwzgOTzZkJamy1vNnnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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