Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '028df42fc36c29d939565e7da34838dfc24d5773041f8a62b7974380dd78b196' 
  AND token = 'kbBjpFC7C2rNNdE3VXwBhGSFzijA9fLBLSeIbP3DFzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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