SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '102759ee4e4cc6461ffbfdf537ee354bb628aaba18cfe03afa3036ab5e11ed8e' 
  AND token = '4nVvzhtg2dX5ruQzCZjKVLfWg+C4UKbzZcvXmjjD8cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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