Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dd86582100f40c16a9891cbcbf598b7e4cd57e556ff979b9f4ebc2c6fd9d8f0' 
  AND token = 'MnmesVH+mdsbizkVB4wafU51SA4W+vj/Mf+/pm1Y96o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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