SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca63675db7a130e3cd69f83f9650df353670ef2db08dc5ef55482f716e31b6c1' 
  AND token = '+hhvS3PaVmjXqVef11B4aupg444/ENg7ZEC7BlRb8LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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