SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ce9947b7ffcc2123532105f7a9d4810f51fea31a59b0040b8ce9c4a413bab81' 
  AND token = 'BuYkBc9W+h/R7CoGRJEwYLnrhAEXeCZdGXS6mhoHHzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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