SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af8f6a439c612092b98fdf585c6ab81dcdf063faaf2d759fb773eed36509a56f' 
  AND token = 'KFCc8oUZlWjlZOj7W432zTzdhdIt3WkjOKlGGgNZqog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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