SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f60119a0b598d9afdce6622eb4f69ce20b2c52428f3d186920626f5c5a7977a' 
  AND token = 'du8/w+JUlRuM6vyZ15AAaK1ZDNygKPbowvsQWO6TKxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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