SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90f99903e1a4e0c84e41119aa5332830a8aae9a9af4f8b7f54362206fb192a39' 
  AND token = 'vN3Y1fzYGxHg2odJHSHtnJZV5AIFUJ9WZOUHCVwV+4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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