SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dcaf39490ed9321022e87260289368b8307c383ef36b8da0c355ae1f12a6d53' 
  AND token = 'Kv2kdVBKhKv/ukIYX5NLBNNKHxs7LSf9lZUbSS7tFqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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