SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2bdc924e76c6ff312251d15695ce51ef716f5eeb985e7ab1f24dbb816492b9' 
  AND token = 'z+COwwB8i9+1BLo/wl3G0JiPJGcp/qivT3VHBaygPoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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