SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fea3f8788e5aa766051e97af275dae4897d901537d6569975b374c2bf9efcdb0' 
  AND token = 'sg2QhV51ey2YLQBZxGsQVZA2D3K8uYrRu4rKtmJzEAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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