SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e87673f119ec8b4ddbb413e505dd9c3f24d699f50732e26f2ad0def99bd8a9b9' 
  AND token = 'ntE9gBKEzUVldmXi3wWFXADXg7ggdbi9qjwGRjq3vgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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