SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '498dcc3e07697c90b25d3333b0f5507152427ca7ca13894c16f04d34e5fee8b7' 
  AND token = 'WmuwKK/JpQNi6Pc+ius6xztwEbQm29kgi0qxGisnThg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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