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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61d36d68c707848cbd14f68d54f096a4b137f5cc0544696b96ea089de214363d' 
  AND token = 'WGsNDJ0WunVwZtWwCWgRzSH8ey1LWFmc0LkGsMOLLaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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