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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cbc15b7973fe3877fd3b9de0530f36042d7632be62e53e07175aa44a4f08d49' 
  AND token = 'DpV2z9YniUwRC/yEyIuNx9c8n2ja1C7k5TCjSwlagq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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