SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c2ae670dcff02aee36f4cd8c7639e65c4b7057adc4a55a6bfb7e6e0479f0d1f' 
  AND token = 'VZ3DU6hxv3lGDj2T+EJDhm26kbKbr6umrOlDNu3/BCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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