SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7cfabd160a47e03c30f35558f2ed47536e41c1701465ff6bb70e8f35f59c999' 
  AND token = '64W+MOAXd/jlJhBHHRB6wRbQTlpkB3s2kNJxGzWAUxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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