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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99f0e7e5a89f6db22d3e3de9a562d047f70c8e4a9ceae4ca830cf098e34578da' 
  AND token = 'oZsj3qZabBIYayPbuJm20L75GmAPOXagU+4M2xpWaLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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