Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50b66dcffb94fe2d01b1414871fc48d6b9b9b95a4e8c1b5771aa8b01b4a9b32f' 
  AND token = '/7l3jA8KnQDg6mws04s7sqPKtBw9MxBbBkMt1TzcKKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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