SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73208cc9037e01c3683d808fa0502a3827b8e330e9f87694c440bf4346a58e49' 
  AND token = 'Rb8KAQ+i/hjI5AU2GjKJDVwJqxtdUVN12G8i1mwEzwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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