SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c73ea13d06ec0c16e4dda73260f5b83f8fbaf6e44e19e3f6959bc4e36d6b2c8' 
  AND token = 'rOUBbX4k+4iZYwLslbqQlvg49awGjFnoz+ro36HoIYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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