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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf808853e4e860e441097d074bbcdeab11cf9ecc7ba86df421eb01c8ca21d2d9' 
  AND token = 'bK0m170nJCnFBhIaYEh6UG3yoPWgwWMzuF3kh5uMXaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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