SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f89de2c09a11d600bec35e2dd3a159c4d2f867bc10583253fec0709b08d90635' 
  AND token = 'uJgV8uGR99wG7O6Xhj2T6B8v+LPI2XMblyme14XbUTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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