SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ad4e9de346ed6f1f5bdf70b1634d07d9d778e8b07412cab724b6cf878483363' 
  AND token = 'hZtKp5v1VfoUQsfxnhguIg7GbmoRE99vT6KKRbK5y/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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